SimpleMachines/SMF2.1 — pull request #1991 by MissAllSunday (2014-06-29 20:16:04+00:00)
Title: Call helper

Another round for finding calls to sub-actions.

- My other search missed some variants like $sub_action and $subaction thus a few other places were still using the string directly fixes #1895 /me hopes...
- call_helper() will now return a boolean false/log an error if the given string cannot produce a callable var.
- Removes some is_callable() checks and instead it places an !empty()